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Full text of "The manufacture and properties of iron and steel"

SEGREGATION AND HOMOGENEITY.
243
plate, and Table XIII-Gr gives the records so obtained from one-quarter-inch sheets, rolled from basic open-hearth slabs made by The Pennsylvania Steel Company. The ingots from which the slabs were made varied in section from S6"x24" to 38"x32", and weighed from 6 to 10 tons each. A record was kept of the part of the ingot from which each slab came, and the corresponding plates were tested both in the natural and in the annealed states. The table gives only the results on annealed bars, for by the reheating and cooling the artificial effects of cold finishing were avoided, and all test-pieces were brought to a common ground of comparison. The plates of any one heat are all of one thickness, the discard of other sizes accounting for the massing members. In each case the order in the list follows the order in the ingot from top to bottom, and the plates from the top give a slightly higher strength than those from the bottom, but the variations are unimportant, not being as great as will often be found in different parts of a single plate rolled from an ordinary plate ingot.
The carbon determinations in Table XIII-G are inaccurate, since
TABLE XIII-G. Annealed Bars from Plates Eolled from Basic Slabs.
NOTE.—Carbon was determined by color and Is therefore unreliable.
1-p,	u			w d , CD ri o	43 a				
IH	0*2	At* A	-w i4>4	•^ i->	*S *	Chemical composition;			
	«	a%*	1&J	dp,	rtfe	per cent.			
a		S-S2	<rt 9 C 3 fc	*i SO d »	5^j				
U	tS'o .	•*> H 3			Q d				
•3 I	Ill PH	pP,.	P	55	i%				
						C.	P.	Mn.	S.
	Top,	49080 48880	81880 81170	86.75 82.00	65.3 63.6	.11 .15	.015 .018	.81 .82	.027 .020
*J		47750	29980	84.50	67.0	.16	.015	.32	.022
		48500	81760	29.50	66.3	.13	.018	.81	.023
		47810	81110	33.00	68.1	.12	.015	.81	.023
		46970	80690	35.00	64.5	.12	.015	.31	.019
a fl	Bottom,	48200	31000	82.50	64.3	.11	.017	.31	.025
5	Average,	48091	81077	83.32	65.8	.13	.015	.81	.023
3	Top,	49380 48010	82080 28760	33.00 83.00	64.2 65.7	.10 .16	.016 .018	.81 .85	.025 .023
^ *£		48760	82030	83.75	64.9	.13	.018	.81	.020
g		49170	82010	82.00	64.2	.18	.015	.82	.024
tt		49040	29940	81.75	60.7	.12	.014	.31	i   .025
		. 47670	80090	83.00	63.8	.14	.018	.34	.010
n	Bottom,	46860	81880	82.60	•65.8	.11	.013	.32	.021
	Average,	48413	80899	82.71	64.1	.13	.015	.83	j033  ,